<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="发布课程"/>
    </el-steps>

    <el-button type="text" @click="openDialog()">添加章节</el-button>

    <!-- 添加和修改 章节 表单弹框 -->
    <el-dialog title="添加章节" :visible.sync="dialogChapterFormVisible">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题" >
          <el-input v-model="chapter.title" />
        </el-form-item>
        <el-form-item label="章节排序" >
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 添加和修改 小节 表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>
          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>
          <el-form-item label="是否免费">
            <el-radio-group v-model="video.isFree">
              <el-radio :label="true">免费</el-radio>
              <el-radio :label="false">默认</el-radio>
            </el-radio-group>
          </el-form-item>
          
          <el-form-item label="上传视频">
              <el-upload
                    :on-success="handleVodUploadSuccess"
                    :on-remove="handleVodRemove"
                    :before-remove="beforeVodRemove"
                    :on-exceed="handleUploadExceed"
                    :file-list="fileList"
                    :action="BASE_API+'/eduvod/video/uploadKnobbleVideo'"
                    :limit="1"
                    class="upload-demo">
              <el-button size="small" type="primary">上传视频</el-button>
              <el-tooltip placement="right-end">
                  <div slot="content">最大支持1G，<br>
                      支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                      GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                      MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                      SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                  <i class="el-icon-question"/>
              </el-tooltip>
              </el-upload>
          </el-form-item>

        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
          <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
     </el-dialog>


    <!-- :key用来区分不同的组件，因为他们有多个 -->
    <ul class="chanpterList">
      <li
          v-for="chapter in allChapterVideo"
          :key="chapter.id">
          <p>
              {{ chapter.title }}
              <span class="acts">
                  <el-button type="text" @click="openAddKnobble(chapter.id)">添加小节</el-button>
                  <el-button style="" type="text" @click="openEdit(chapter.id)">编辑</el-button>
                  <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
              </span>
          </p>
          <div class="yincang">1</div>
          <!-- 小节 -->
          <ul class="chanpterList videoList">
              <li
                  v-for="video in chapter.children"
                  :key="video.id">
                  <p>{{ video.title }}
                      <span class="acts">
                          <el-button type="text" @click="openEditKnobble(video.id)">编辑</el-button>
                          <el-button type="text" @click="removeKnobble(video.id)">删除</el-button>
                      </span>
                  </p>
                  <div class="yincang">1</div>
              </li>
          </ul>
        </li>
    </ul>
    


    <el-form label-width="120px">
      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import chapter from '@/api/edu/chapter'
import knobble from '@/api/edu/knobble'
export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      saveVideoBtnDisabled:false,
      allChapterVideo:[],
      courseId:'',
      chapter:{//章节
        title:'',
        sort:0
      },
      video: {//小节
        title: '',
        sort: 0,
        isFree: true,
        videoSourceId: '',
        videoOriginalName:''
      },
      dialogChapterFormVisible:false,//章节弹框
      dialogVideoFormVisible:false,//小节弹框
      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },
  created() {
    if(this.$route.params&&this.$route.params.id){
      this.courseId=this.$route.params.id
      this.getChapterVideo()
    }  
  },
  methods: {

    //点击确定调用（真删）
    handleVodRemove(){
      knobble.deleteVideoById(this.video.videoSourceId)
        .then(res=>{
            this.$message({
                type: 'success',
                message: '删除成功!'
            })
            //清空文件列表
            this.fileList=[],
            //清掉视频id，视频名称
            this.video.videoSourceId=''
            this.video.videoOriginalName=''
        })
    }, 
    //点击x调用，（删除前）
    beforeVodRemove(file, fileList){
      return this.$confirm(`确定移除 ${ file.name }？`);
    },
    //上传视频成功调用
    handleVodUploadSuccess(response, file, fileList){
      this.video.videoSourceId=response.data.videoId
      this.video.videoOriginalName=file.name
    },
    //上传前的配置(这里设置了只能传传一个)
    handleUploadExceed(files, fileList){
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },

    //删除小节
    removeKnobble(knobbleId){
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {//点击确定
                knobble.deleteKnobble(knobbleId)
                  .then(response=>{
                    this.$message({
                        type: 'success',
                        message: '删除成功!'
                    })
                    this.fileList=[]
                    this.getChapterVideo()//刷新
                  })
            })
    },

    //弹添加小节框
    openAddKnobble(chapterId){
      this.dialogVideoFormVisible=true
      //章节id
      this.video={title: '',sort: 0,isFree: true,videoSourceId: ''}//先清空
      this.video.chapterId=chapterId
      this.video.courseId=this.courseId
      this.fileList=[]
    },
    //添加小节
    addKnobble(){
      if(this.video.videoSourceId==''){
        this.$message({
            type:'error',
            message:'请稍后，视频正在上传!'
          })
      }else{
        knobble.addKnobble(this.video)
        .then(res=>{
          //关闭弹框
          this.dialogVideoFormVisible=false
          //提示
          this.$message({
            type:'success',
            message:'添加小节成功!'
          })
          //刷新页面
          this.getChapterVideo()
        })
      }
      
    },
    //编辑小节
    updateKnobble(){
      if(this.video.videoSourceId==''){
        this.$message({
            type:'error',
            message:'请稍后，视频正在上传!'
          })
      }else{
        knobble.updateKnobble(this.video)
        .then(res=>{
          //关闭弹框
          this.dialogVideoFormVisible=false
          //提示
          this.$message({
            type:'success',
            message:'修改小节成功!'
          })
          //刷新页面
          this.getChapterVideo()
        })
      }
      
    },
    saveOrUpdateVideo(){//小节弹框的确定按钮
      if(!this.video.id)
        this.addKnobble()
      else
        this.updateKnobble()
    },
    openEditKnobble(knobbleId){//打开编辑小节
      this.dialogVideoFormVisible=true
        knobble.getKnobbleById(knobbleId)
          .then(response=>{
            this.video=response.data.video
          })
    },









    //删除章节
    removeChapter(chapterId){
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {//点击确定
                chapter.deleteChapter(chapterId)
                  .then(response=>{
                    this.$message({
                        type: 'success',
                        message: '删除成功!'
                    })
                    this.getChapterVideo()//刷新
                  })
            })
    },
    //修改章节弹框
    openEdit(chapterId){
      this.dialogChapterFormVisible=true
      chapter.getChapter(chapterId)
        .then(response=>{
          this.chapter=response.data.chapter
        })
    },
    //打开弹框
    openDialog(){
      this.dialogChapterFormVisible=true
      this.chapter={title:'',sort:0}
    },
    //添加章节
    addChapter(){
      //添加章节的courseId
      this.chapter.courseId=this.courseId

      chapter.addChapter(this.chapter)
        .then(response=>{
          //关闭弹框
          this.dialogChapterFormVisible=false
          //提示
          this.$message({
            type:'success',
            message:'添加章节成功!'
          })
          //刷新页面
          this.getChapterVideo()
        })
    },
    //修改章节
    updateChapter(){
      chapter.updateChapter(this.chapter)
        .then(response=>{
          //关闭弹框
          this.dialogChapterFormVisible=false
          //提示
          this.$message({
            type:'success',
            message:'修改章节成功!'
          })
          //刷新页面
          this.getChapterVideo()
        })
    },
    saveOrUpdate(){
      if(!this.chapter.id)
        this.addChapter()
      else
        this.updateChapter()
    },
    //根据课程id查询其章节、小节
    getChapterVideo(){
      chapter.getChapterVideo(this.courseId)
        .then(response=>{
          this.allChapterVideo=response.data.allChapterVideo
        })
    },
    previous() {
      console.log('previous')
      this.$router.push({ path: '/course/info/'+this.courseId })
    },
    next() {
      console.log('next')
      this.$router.push({ path: '/course/publish/'+this.courseId })
    }
  }
}
</script>
// scoped表示只在当前页生效
<style scoped>
.yincang{
  transform: scale(0,0);
}
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}
.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>